Not just books. When searching for information online, for anything where things haven't changed significantly in the last few years, I definitely favour a post on SO/SE/HN/reddit/etc dated before 2023 over those that are later. And where there are no good looking references before that, the earlier the better.

Of course there are no doubt people out there realising that a fair few of us do this, and are starting to edit posts to pre-date them as a sort of SEO trick…